This is my favorite brand of meter, the one I have literally used my entire professional career as a safety engineer and emergency responder. I am not naming the brand as I do not want to cause them any issues, but just understand this, ALL brands will have this level of accuracy. Most users of these instruments never really think about how accurate they are. Most just assume they are highly accurate. As my previous posts discussed the limitation of the LEL sensors, this post I want to point out a limitation of the Oxygen sensor.
